org.apache.tools.ant.util

Class JavaEnvUtils


public class JavaEnvUtils
extends java.lang.Object

A set of helper methods related to locating executables or checking conditons of a given Java installation.

Since:
Ant 1.5

Field Summary

static String
JAVA_1_0
Version constant for Java 1.0
static String
JAVA_1_1
Version constant for Java 1.1
static String
JAVA_1_2
Version constant for Java 1.2
static String
JAVA_1_3
Version constant for Java 1.3
static String
JAVA_1_4
Version constant for Java 1.4
static String
JAVA_1_5
Version constant for Java 1.5

Method Summary

static String
getJavaVersion()
Returns the version of Java this class is running under.
static String
getJdkExecutable(String command)
Finds an executable that is part of a JDK installation based on the java.home system property.
static String
getJreExecutable(String command)
Finds an executable that is part of a JRE installation based on the java.home system property.
static Vector
getJrePackageTestCases()
Testing helper method; kept here for unification of changes.
static Vector
getJrePackages()
get a vector of strings of packages built into that platforms runtime jar(s)
static boolean
isJavaVersion(String version)
Compares the current Java version to the passed in String - assumes the argument is one of the constants defined in this class.

Field Details

JAVA_1_0

public static final String JAVA_1_0
Version constant for Java 1.0


JAVA_1_1

public static final String JAVA_1_1
Version constant for Java 1.1


JAVA_1_2

public static final String JAVA_1_2
Version constant for Java 1.2


JAVA_1_3

public static final String JAVA_1_3
Version constant for Java 1.3


JAVA_1_4

public static final String JAVA_1_4
Version constant for Java 1.4


JAVA_1_5

public static final String JAVA_1_5
Version constant for Java 1.5

Method Details

getJavaVersion

public static String getJavaVersion()
Returns the version of Java this class is running under.

Returns:
the version of Java as a String, e.g. "1.1"


getJdkExecutable

public static String getJdkExecutable(String command)
Finds an executable that is part of a JDK installation based on the java.home system property.

You typically find them in JAVA_HOME/bin if JAVA_HOME points to your JDK installation.

Since:
Ant 1.5


getJreExecutable

public static String getJreExecutable(String command)
Finds an executable that is part of a JRE installation based on the java.home system property.

java, keytool, policytool, orbd, rmid, rmiregistry, servertool and tnameserv are JRE executables on Sun based JRE's.

You typically find them in JAVA_HOME/jre/bin if JAVA_HOME points to your JDK installation. JDK < 1.2 has them in the same directory as the JDK executables.

Since:
Ant 1.5


getJrePackageTestCases

public static Vector getJrePackageTestCases()
Testing helper method; kept here for unification of changes.


getJrePackages

public static Vector getJrePackages()
get a vector of strings of packages built into that platforms runtime jar(s)

Returns:
list of packages


isJavaVersion

public static boolean isJavaVersion(String version)
Compares the current Java version to the passed in String - assumes the argument is one of the constants defined in this class.

Returns:
true if the version of Java is the same as the given version.

Since:
Ant 1.5


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